Automatic or semi-automatic telephone-exchange system.



G. A. BETULANDBR. AUTOMATIC 0R SEMI-AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED 1113.27, 1914. 1,129,543,, Patented Feb. 23, 19 I 2 SHBETB-SHBET 1- G. A. BETULANDER. AUTOMATIC OR SEMI-AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED PEB.27, 1914.

1,1 29,543. Patented Feb. 23, 1915.

2 SHEETS-SHEET z,

g z'ln. canes Zhycniar':

/47 Jim m;

- as well known, taken into engagement only UNITED STATES PATENT OFFICE.

. GorrnrLr-anseamus Barnum-D R, or VILLA cais'ron, sonnnromvs vI'LLAs'rAn,

SWEDEN.

AUTOMATIC OR SEMI-AUTOMATIC TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Feb. 23, 19 15.

Application filed February 2?, 1914. Serial No. 821,550.

To all whom it mag concern:

Be it known that I, Go'rrHILr ANSGARIUS BETULANDER, a subject of the King of Sweden, and resident of Villa Castor, Sodertbrns Villastad, in the Kingdom Sweden, have invented certain new and useful Improvements in Automatic or Semi-- Automatic' Telephone-Exchange Systems, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to automatic or semi-automatic telephone exchange systems in which lines are selected by meansof relays used in different combinations, said combining relays being selected and operated by means of a selector adapted to beset by the selective impulses.

' More especially the invention relates to systems in which the selecting and the connecting operations are efiected separately and; by separate means.- In systems of that class the. selecting devices are,

during the establishing of the connections as they are used onlyto select and toindicate the wanted group or the wanted subscriber, while the talking connections are established by separate connecting means. As the selecting devices are thus, engaged only during a small part of the whole talking period, they may be allotted in common to groups of junction lines whereby the number of selectingdevices is considerably reduced. In such systems the sets Tof combining relays mentioned above are to'be referred to the selecting devices as they are used only for selecting or indicating purposes, and, quently, they as well as the selectors, are provided in a reduced number.

The object of the present invention is to further reduce the number of these sets of oombiningrelays so that one and the same set of relays may be used in common, by two or more selectors. For that'purpose every selector is provided with one series of selecting relays for every digit of the mim bers to be selected, said series being adapted to register the selective impulses of the appertaining digit and then to remain in'the condition thus' established until all figures of the number wanted hate been delivered.

The selectors may, consequently, be set Si--- multaneously and independently. "of each other and then successively operate the som in the accompanying drawing in whichconseassigned to first subscribers of the-difi' ns, the-lines 12 to the second subscri mon setof combining relays as the afiecting of the combining relays, after the selector has been set, may be deferred for any length of'time.

A form of the invention isrepresented Figure Lis a line arrangement adaptedfor a group of one thousand subscribers and Fig. 2 1s a selector according to this in- Iyention and adapted for two figure numers.

In Fig.1 the relays 1 to 9 inclusive are combining relays adapted to be selected and I "the contacts 15, of the relays 7, 8 and 9 and furtherto the earthed pole of the battery 7 through contacts 16 of the relays 4:, 5:and 6, common lines 17, 18 and 19, and contacts 20 of the relays 1, 2 and 3. In this instance,

for the sake of simplicity, only-three hundreds groups 21, 22 and 23 and in each hundreds group only three tens groups 24, 25 and. 26 of relays 10 are shown. Further, in each tens group there" are only three relays 10. The opratihn 'of a certain relay 10 is efi'ected by energizing thoseof the combining relays 1 to 9 inclusive whichcorrespond to the different figures of the number of the relay 10 in gpesti'on. If, for instance, the relay 10 of t e subscriber No. 333 1s to be operated this is efiected by energizing the relay 3, the relay 6 of the third hundreds and the relay 9. A'cincuit is thereby estab-' lished for'the relay 10in question through the contact 20 of the relay 3, line 19, contact 16 of the relay 6 -ofthe third hundreds'line 13, and contact 15 of the relay 9.-

.The shown arrangement-m bev modifie in such a manner'that the relays-1, 2 and 3 correspond to the tens a the relays 4;, and 6, to the jihits the lin 11 being there,

- the difierent ltens, and so on.

part. of Fig. I- incyosed by the dotted roe lines represents, evidently, the line arrangement for one hundred subscribers.

1 The selector shown in Fig. 2 compries two series of selecting relays 27 and 28, Viz.

one tens series I for the selecting of the tensgroups, one unit series II for the selecting of the special lines of the groups respectively,

and one series III of switching relays 29. Each series comprises ten relays but only three 6f themare shown, as the connections of the relays are the same throughout. Two relays 30- and 31, the latter of which'is slow acting, are adapted to efiect the final emisrelays has been finished.

sion of the marking impulse. r In addition, a slow acting relay 32 and an ordinary relay 33 are provided, which together'with the relay 30 control the circuit of the relay 31, so'

that the marking impulse is not sent out until the shifting of both series of connecting To the contacts 34 of the different selecting relays 27 of the series'I the group relays 4, 5, etc., are connected, the first being adapted to, connect the lines 11'with the common lines 17, 18 and 19, the second to connect the lines 12 with the'same lines, etc.,'as also shown in Fig. 1. The remaining group relays,-not shown, are arranged in an analogous mamien The selector operates -in the following manner; The two branches of the calling subscribers line. or of a junctionline are first connected in any knownrnanner with twowires '35 and 36. The shifting of the selectoris then efi'ected in such a manner, that the line'branch 36 continually current carrying, while the shifting impulses v are sent through the line branch 35. The

currents are effected by the line branches being connected with earth through the operation at the substation or at the operatorls position. Acurrent passes first from-earth through the. line branch 36 and parallelly through the relays 30 and 32 to the negafirst subsequent shifting Switching relayli29 to the battery. 'The tive pole-of the battery 14. Con'sequently, the-relays 3O and 32 attract their armatures, at first, however,'without any effect. The impulse passes frcm earth through the 'line branch 35, the contact 37 of the first selecting relay 28 of, the unit series II and the corresponding 7 switching relay 29 energizes; upon the closure of that circuit thereby closing the operating circuit of the first selecting relay 28 through thecontact 38-and the operating circuit of the first relay 2710f the tens series I through the contact 39 of the relay 32, con- .tact 40 of relay 33 and contact 41 of the .the contact 42 first switchin [relay 29. The selecting relay 28 puts itsel in a locking circuit through of the relay 30 andits own contact 43. The selecting relay 27 puts itself in-a locking. circuit through the contact 39 of the relayg32'and its own contact 44. After the relay 28 has attracted its-armature the first shifting impulse is maintained through the contact-45 of the relay 28 and the contact 46 of the relay 29. As the first shifting impulse ceases, the switching relay 29 releases its armaturetherebyclosing a contact. 47. Consequently, the second shifting impulse passes through the contacts 45 and 47, the contact 37 of the second selecting relay 28'and the corresponding switching relay 29. Owing to this factthe second selecting relays 27Jand 28 are operated in-the same manner as the corresponding preceding relays. In this manner as many selecting relays are cut in successively as there are shifting impulses sent out. After the issuing of the first series of impulses the current through the line branch 36 is interrupted for a moment the relays 30 and 32 being thereby deprived of current. The relay 30 releases its armature at once, while the slowacting relay 32 still keeps its armature in attracted position. Qwingto this fact the contact 42 is broken, so that the selecting relays 28 of the series II, already cut in, are deprived of'current and release their armatures. Further, a circuit is closed extending from earth through the contact 39 of the relay 32, the contact 48 of the relay 30 and the relay 33 to the battery. The relay 33 energizes upon 05 the closu e of this circuit thereb putting itself in a ocking circuit througlrt e contact. 39 of the relay 32 and its own contact 49. As the line branch 36 immediately after is again. connected to earth, the current passes through the relays 30 and 32 as well as through the relay 31' via contact 50 of relay 33. I The subsequent shifting impulses through the line branch 38 now operate in the same manner as before the-selectin re- 1 lays of.v the series II b means of the switching relays 29 the selec ing relays bein thereby .put'in locking circuits through t e con tact 39 of the relay 32, contact 51 of the relay 33 and the conta ts .43, which circuits 1107* series I are not afl'ected by After the issuing of the second series 0 pulses, by which a number of selecting ref lays of the unit series 11 have been-"cut in, the current through the line branch, 36 is broken. In the same moment the relay 30. releases its armature, and closes the contact 52 thereby closing a circuit elgtendin .from

earth through the contact 53 of the re ay 31,

contact 52, contacts 54 of the operated re= lays 27 and one of the group relaya'forina stance 5,to the battery; The said relay 5, 135 upon operating, closes the contacts 16 and thereby a marking circuit through-the con- I tacts 55 of, for instance, the-twofirst selectmg relays 28 of the'series II, the contact 56 of the third selecting relay 28, line 158, the no now is open, the selecting relays of the to the unit i I corresponding contact 16 of'the re1ay 3 and i the correspondin line 12. -The current ris-i ing in the Gil'Clllt last described, which 1s broken as the relay 31 releases its armature,

eflects now the desired connection. finally, the relay 32 releases its armature all looking circuits are broken at the contact 39 so that the relays are denergized. Theselector is thereby restored in normal condition and is immediately ready for effecting a new connection.

Having now described my'invention, what I claim as new and desire to secure by Letters Patent is; I

In a telephone exchange system, the combination wlth combining relays, lines to be Witnesses:

selected by operating said relays in different combinations and a selector for selecting and operating said combining relays of a number of seriesof selecting relays, said series corresponding to the difi'erent digits ofthe numbers to be selected and being adapted to registerthe current impulses and circuits for said combining relays controlled by the selecting relays.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

' I GOTTHILF ANSGARIUS BETULANDER- N ms G. Ltmps'rnnr, GBETA 'PRIEN. 

